<!doctype html>
<html lang="zh-cn">
<head>
  <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
  <meta name="viewport" content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
  <meta http-equiv="X-UA-Compatible" content="ie=edge">
  <title>聚光灯</title>
  <!--  <link rel="stylesheet" href="./styles/index.css">-->
</head>
<style>
  html,
  body {
    width: 100%;
    height: 100%;
    background-image: url("https://images.unsplash.com/photo-1440688807730-73e4e2169fb8?dpr=1&auto=format&fit=crop&w=1500&h=1001&q=80&cs=tinysrgb&crop=");
    background-repeat: no-repeat;
    background-size: cover;
    overflow: hidden;
  }

  .radial-circle {
    position: absolute;
    top: -100%;
    left: -100%;
    right: -100%;
    bottom: -100%;
    background: radial-gradient(circle at 50% 50%, transparent 0%, transparent 3%, rgba(0, 0, 0, 0.7) 3.5%, rgba(0, 0, 0, 0.8) 100%);
    animation: move 10s infinite alternate;
  }

  @keyframes move {
    0% {
      transform: translateX(-10%);
    }
    100% {
      transform: translateX(10%);
    }
  }

</style>
<body>
<div class="radial-circle"></div>
</body>
</html>
